Optimization of the heterogeneous electro-Fenton process assisted by scrap zero-valent iron for treating textile wastewater: Assessment of toxicity and biodegradability

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dc.citation.journalTitleJournal of Water Process Engineeringeng
dc.contributor.authorGil, E.
dc.contributor.departmentUniversidad EAFIT. Departamento de Ingeniería de Procesosspa
dc.contributor.researchgroupDesarrollo y Diseño de Procesosspa
dc.date.accessioned2019-08-18
dc.date.accessioned2021-04-12T19:06:21Z
dc.date.available2021-04-12T19:06:21Z
dc.date.issued2019-08-26
dc.date.submitted2019-03-04
dc.description.abstractIn this work, the heterogeneous electro-Fenton process assisted by scrap zero-valent iron (SZVI) and with graphite electrodes (as anode and cathode) is studied as an alternative way to treat wastewater from a textile plant located in Medellín, Colombia. The effects of the initial pH, SZVI load, and current density in the SZVI-assisted electro-oxidation process (EO/SZVI) are analyzed and optimized using multivariable regression models generated using the Box–Behnken experimental design and convex nonlinear optimization. The EO/SZVI process leads to maximum reductions of approximately 100%, 67%, and 59% in color, chemical oxygen demand (COD), total organic carbon (TOC), respectively, under the optimal operating conditions of pH of 3.5. Further, it leads to an SZVI concentration of 0.6 g/L, and a current density of 20 mA/cm2 during 30 min of electrolysis. The post-process pollutants are characterized further using molecular weight distribution measurements, ultraviolet–visible spectroscopy, high-performance liquid chromatography, biodegradability, and toxicity. The results show that the treated effluent is polluted mostly by carboxylic acids of low molecular weight. A remarkable enhancement of the biodegradability of the effluent is evidenced by an increase in the BOD5/COD ratio (biodegradability index) from 0.15 to 0.54. Although the EO/SZVI process does not improve the toxicity (as measured by the mortality of Artemia salina), the latter is reduced subsequently from 100% to 20% through adsorption using activated carbon (AC). The findings of this study indicate that the EO/SZVI process is an effective and promising alternative for treating textile wastewater. © 2019 Elsevier Ltdeng
dc.identifierhttps://eafit.fundanetsuite.com/Publicaciones/ProdCientif/PublicacionFrw.aspx?id=9176
dc.identifier.doij.jwpe.2019.100924
dc.identifier.issn22147144
dc.identifier.otherSCOPUS;2-s2.0-85071120203
dc.identifier.urihttp://hdl.handle.net/10784/28267
dc.language.isoeng
dc.publisherElsevier Ltd
dc.relationDOI;https://doi.org/10.1016/j.jwpe.2019.100924
dc.relationSCOPUS;2-s2.0-85071120203
dc.relation.urihttps://www.journals.elsevier.com/journal-of-water-process-engineering
dc.rightshttps://v2.sherpa.ac.uk/id/publication/issn/2214-7144
dc.sourceJournal of Water Process Engineering
dc.subjectElectro-Fentoneng
dc.subjectOptimizationeng
dc.subjectScrap zero-valent ironeng
dc.subjectTextile industrial wastewatereng
dc.subjectToxicityeng
dc.titleOptimization of the heterogeneous electro-Fenton process assisted by scrap zero-valent iron for treating textile wastewater: Assessment of toxicity and biodegradabilityeng
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:eu-repo/semantics/publishedVersion
dc.typeinfo:eu-repo/semantics/articleeng
dc.typearticleeng
dc.typeinfo:eu-repo/semantics/publishedVersioneng
dc.typepublishedVersioneng
dc.type.localArtículospa

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